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A Prince George's County, Md. firefighter dressed in (Credit: AP)

A Prince George's County, Md. firefighter dressed in a protective suit walks into a government mail screening facility in Hyattsville, Md. (April 17, 2013)

Ricin scare hits lawmakers

Investigators probe packages sent to politicians in Washington, D.C. and other areas around the U.S. (April, 2013)

Shannon Richardson is placed into a Titus County
(Credit: AP / The Texarkana Gazette)

Shannon Richardson is placed into a Titus County Sheriff's car after an initial appearance at the federal building Texarkana, Texas. The FBI says Shannon Richardson admitted sending ricin-tainted letters to President Barack Obama and New York City Mayor Michael Bloomberg, but only after trying to pin it on her husband. (June 7, 2013)

Actress Shannon Richardson poses for a photo, in
(Credit: AP)

Actress Shannon Richardson poses for a photo, in Texarkana, Texas. Richardson was charged with mailing a threatening communication to the president. She could face up to 10 years in prison if convicted, U.S. attorney's office spokeswoman Davilyn Walston said.

Undated Facebook photograph of husband and wife, Nathaniel
(Credit: Facebook)

Undated Facebook photograph of husband and wife, Nathaniel and Shannon Richardson. She charged with mailing a threatening communication to the president. She could face up to 10 years in prison if convicted, U.S. attorney's office spokeswoman Davilyn Walston said.

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Authorities search a New Boston, Texas residence in
(Credit: AP)

Authorities search a New Boston, Texas residence in connection with a federal investigation surrounding ricin-laced letters mailed to President Barack Obama and New York Mayor Michael Bloomberg. (May 31, 2013)

A Prince George's County, Md. firefighter dressed in
(Credit: AP)

A Prince George's County, Md. firefighter dressed in a protective suit walks past emergency personel into a government mail screening facility in Hyattsville, Md. (April 17, 2013)

A Prince George's County, Md. firefighter dressed in
(Credit: AP)

A Prince George's County, Md. firefighter dressed in a protective suit walks into a government mail screening facility in Hyattsville, Md. (April 17, 2013)

A Prince George's County, Md. firefighter, left, gets
(Credit: AP)

A Prince George's County, Md. firefighter, left, gets dressed in a protective suit before going into a government mail screening facility in Hyattsville, Md. (April 17, 2013)

A Prince George's County, Md. firefighter dressed in
(Credit: AP)

A Prince George's County, Md. firefighter dressed in a protective suit walks out of a government mail screening facility in Hyattsville, Md. (April 17, 2013)

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A U.S. Capitol Police hazmat vehicle is parked
(Credit: AP)

A U.S. Capitol Police hazmat vehicle is parked at a mail processing plant in Prince George's County where a letter addressed to Sen. Roger Wicker, R-Miss., tested positive for ricin. (April 17, 2013)

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